Order Ptychopariida, Suborder
Olenina, Family Olenidae, Subfamily: Triarthrinae
Time: Upper Ordovician
size of trilobites is 15 mm
Eastview Formation , Quebec City, Quebec, Canada
This is an attractive plate featuring five specimens. One is complete,
three others are mostly complete, and there is the large disarticulated
specimen. The trilobite genus Triarthrus is also found in New York
State and Scandinavia and, importantly, is the last of the Olenid
trilobites that were prevalent in the Cambrian. Some Triarthrus
found in the Rome, New York area have exibited soft tissue preservation,
with preservation iron pyrite, indicating an anoxic environment.
Such preservation is extremely rare in trilobites, and thus Triathus
has has enabled the study trilobites anatomy.
see: Canadian Trilobites